Spectrum Chemical manufactures and distributes fine chemicals with quality you can count on including those with CAS number 623-27-8, Whether you call it Terephthalaldehyde, 1 -4-Benzenedicarboxaldehyde or Terephthaldicarboxaldehyde you can be assured the Terephthalaldehyde products offered by Spectrum, meet or exceed the grade requirements or specifications for each individual product.